@width:200px;
@height:@width + 200px;
@red:'red';
@margin1:10px;
.box{
    width:@width;
    height:@height;

    &>div{
      height: 300px;
      background-color: brown;
      margin:@margin1;

      &>div{
          background-color: darkgoldenrod;
          height: 200px;
          margin:@margin1;

          &>div{
              background-color: darkgreen;
              height: 100px;
              margin:@margin1;
          }
      }
    }
    }